1, bigger

2, thicker

3, older

4, longest

5, taller/tallest

6, cleverer

7, as pretty

8, longest

9, more expensive

10, less

11, better

12, highest

13, more interesting

14, quieter than

15, smaller 

16, taller

17, better

18, further

19, stronger

20, the most popular

1. Your house is bigger than my house.

2. These books are thicker than those books.

3. Hoi An Ancient Town is the oldest town in Viet Nam.

4. The Great Wall of China is the longest world's structure. 

5. Nam is taller than Ba. He is the tallest boy in class 6A.

6. This girl is clever than that girl.

7. Marry is pretty as her sister.

8. The Nile River is the longest river in the world.

9. A new house is more expensive than an old one.

10. We're had more little difficulty with this part than that one. 

11. His English is best of these students.

12. Mount Everest is highest mountain in the world.

13. Travelling by air or car, which is more interesting?

14. It's too noisy here. Can we go somewhere more quiet? 

15. Hanoi is smaller than HCMcity.

16. Petronas Twins Towers are taller than Sears Towers.

17. Thanks to the progress of science, our life is becoming and better.

18. In order to get good marks, we have to do far practice. 

19. John is much stronger than I thought.

20. Mr. Kelly is popular man in that organization. Nobody is as famous as him.